Code Definition

U2503 — Missing CAN Message From Instrument Cluster (IC)

System: Network Communication  |  Type: Generic (OBD-II Standard)  |  Make: Ford

About U2503

U2503 is a generic (obd-ii standard) network communication diagnostic trouble code recorded for Ford vehicles. It belongs to the U-prefix family of codes, which covers inter-module network communication (CAN, LIN, FlexRay, or similar) faults.

Scanning & clearing: Network (U) codes report communication faults between modules. When diagnosing U-codes, checking the vehicle's CAN bus integrity, supply/ground at each module, and reading all modules for related faults is usually the first step.

Because U2503 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

DTC U2503 is a manufacturer specific network code set when a control module does not receive an expected CAN message from the Instrument Cluster within a calibrated timeout while the ignition is in run. The receiving module monitors cluster traffic for items such as warning indicator status, odometer data, and driver information, and logs this fault when the cluster message is absent for longer than allowed, indicating a loss of communication from the cluster rather than invalid data. On many vehicles the cluster is a busy node and sometimes acts as a gateway, so its silence can disturb severa...

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